- (geometry) a polyhedron with four faces; the regular tetrahedron, the faces of which are equal equilateral triangles, is one of the Platonic solids.
Etymology: From tetra-, "four" + hedron, "seat".
- French: tetraèdre
- German: Tetraeder
- Italian: tetraedro
- Spanish: tetraedro
Supplemental Details:Sponsor an extended definition for tetrahedron for as little as $10 per month. Click here to contact us.